typescript 打字稿错误：TS2304：找不到名称“$”
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typescript error: TS2304: Cannot find name '$'
提问by user1934212
The statement
该声明
x = $('#msgBox_' + scope.boxId).position().left;
generates an
产生一个
error TS2304: Cannot find name '$'
错误 TS2304：找不到名称“$”
although jqueryand @typesare installed in the node_modules folder.
虽然jquery和@types安装在 node_modules 文件夹中。
My tsconfig.json looks like that:
我的 tsconfig.json 看起来像这样：
{
"compilerOptions": {
"module": "commonjs",
"target": "es5",
"sourceMap": true,
"moduleResolution": "node",
"declaration": true
},
"exclude": [
"node_modules"
]
}
How can I fix that?
我该如何解决？
回答by George Pasquali
Did you try to :
您是否尝试过：
import $ = require('jquery');
at the 1 line? This should work. Though you should have a deeper look into es6 modules and ts modules to get a grip on how you could take advantage of the es6 modular system. Also d.ts files...
在第 1 行？这应该有效。尽管您应该更深入地了解 es6 模块和 ts 模块，以了解如何利用 es6 模块化系统。还有 d.ts 文件...
This should be helpful: https://www.typescriptlang.org/docs/handbook/modules.html
这应该会有所帮助：https: //www.typescriptlang.org/docs/handbook/modules.html
回答by user1934212
Turns out I was missing the "@types/jquery" node module, which contains a definition of "$". Once I added "@types/jquery": "^3.2.5" to the list of "devDependencies" in my package.json and reinstalled via "npm install", everything worked fine.
结果我错过了“@types/jquery”节点模块，它包含一个“$”的定义。一旦我将 "@types/jquery": "^3.2.5" 添加到我的 package.json 中的 "devDependencies" 列表并通过 "npm install" 重新安装，一切正常。
回答by Brant
If AngularCLI is where your injecting JQuery, then in your controller/component, you can declare the variable like so:
如果 AngularCLI 是您注入 JQuery 的地方，那么在您的控制器/组件中，您可以像这样声明变量：
declare var $: any;
回答by Steffi Keran Rani J
One reason for this kind of error is your node_modulesdoesn't contain the type definitions for jquery ie. the package @types/jqueryis missing.
这种错误的一个原因是您的node_modules不包含 jquery 的类型定义，即。包裹@types/jquery不见了。
My workaround is as follows:
我的解决方法如下：
Open the command prompt in the root of your project folder and type:
npm install --save @types/jquery.If you are posed with a question to choose the version, choose the latest one.
Once the above command ends successfully, run
yarn install.Once the above install is success, run
yarn startto start your project.
在项目文件夹的根目录中打开命令提示符并键入：
npm install --save @types/jquery.如果您遇到选择版本的问题，请选择最新版本。
上述命令成功结束后，运行
yarn install.上述安装成功后，运行
yarn start以启动您的项目。
